A 100 g sample of a soil was shaken with a strong solution of BaCl 2 buffered at pH 8.2. The soil suspension was then filtered, the filtrate was discarded, and the soil was thoroughly leached with...

A 100 g sample of a soil was shaken with a strong solution of BaCl₂
buffered at pH 8.2. The soil suspension was then filtered, the filtrate was discarded, and the soil was thoroughly leached with distilled water to remove any no exchangeable Ba²⁺. Then the sample was shaken with a strong solution of MgCl₂
and again filtered. The last filtrate was found to contain 10,520 mg of Mg²⁺
and 258 mg of Ba²⁺. What is the CEC of the soil?